<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="./css/style.css">
    <!-- <link rel="stylesheet" href="./css/reset.min.css"> -->
</head>
<body>
    <button class="key-btn  tri-font" style="height: 100px; width: 100px;">
        s<sup>y</sup>
    </button>
    
</body>
</html>